#ifdef a
//每个字符插入一个空格(字符数组)
#include<stdio.h>
#include<string.h>
void InsertSpace(char input[]) {
    int sz = 0;
    char tmp[100] = { 0 };
    strcpy(tmp, input);
    char* point = tmp;
    while (*point) {
        input[sz++] = *point;
        point++;
        if (*point)
            input[sz++] = ' ';
    }
    input[sz] = '\0';
   
}
int main() {
    char input[100] = { 0 };
    scanf("%s", input);
    InsertSpace(input);
    puts(input);
    return 0;
}
#endif